Ron Paul Supporter Shoots CHP Officer Dead
Computer Nerd Shhots CHP Officer Dead
Organic Farmer Shoots CHP Officer Dead
Former Amazon Employee Shoots CHP Officer Dead
All of those are just as accurate as your singling out of his politics, and could be the motivating factor in the shooting as easily as his political leanings.
The thing is, we all "know" that traffic stops are the most dangerous activity that cops engage in. We do not know what, if any, tactical "errors" the CHP might have committed, but my guess is that he remained in front of the driver instead of moving to be behind the driver.